Malicious PDF — malware analysis report

Static analysis result for SHA-256 d9464615bfafc51b…

MALICIOUS

PDF

69.9 KB Created: 2021-09-08 09:00:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: b99968dedf2851495174603d447aa0cd SHA-1: 57fda342e7dd9b23ee140008e89e947c931c5b58 SHA-256: d9464615bfafc51b9ee957e722e8af0bf3f331bedcaad646b66f565501342534
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as Pdf.Phishing.Trojan. The file contains numerous embedded URLs, many pointing to compromised WordPress sites or disposable hosting, suggesting it functions as a link farm. These links likely lead to phishing pages or further malware downloads, aligning with a spearphishing attachment attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • PDF link farm points to compromised-WordPress upload storage medium PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM
    PDF contains multiple clickable links, across many distinct hosts, whose targets are random-slug files parked in the upload directories of vulnerable WordPress form plugins (FormCraft, Super Forms). This is the hallmark of the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains hosted on compromised sites. The PDF itself carries no exploit — the risk is the linked destinations.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://medvor.ru/uplcv?utm_term=karcher+window+vac+instruction+manual PDF link annotation
    • https://readxyz.org/wp-content/plugins/super-forms/uploads/php/files/b3c6689674821ef91c1a644f8e810de9/pawasuzatomitipinuledek.pdfIn PDF document text
    • http://www.hollyskauaicondo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bb64cf4e64d---56584243572.pdfIn PDF document text
    • https://dakhoathienhoa.net/images/files/vijodunedawo.pdfIn PDF document text
    • https://actorconseil.com/files/file/derotane.pdfIn PDF document text
    • http://sqc.jp/user_data/editor/ckfinder/core/connector/php/upload/files/kopuwarimu.pdfIn PDF document text
    • https://amalighting.com/wp-content/plugins/super-forms/uploads/php/files/0e2157cf932542a234cce543f4ac7b70/jagusewemofuruw.pdfIn PDF document text
    • http://arqing.es/ckfinder/userfiles/files/80138354088.pdfIn PDF document text
    • http://originalavto.ru/userfiles/file/lifavosirajodimi.pdfIn PDF document text
    • http://www.microsinusectomi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607fff2656a54---93313541341.pdfIn PDF document text
    • https://msiutilities.net/documents/98860406214.pdfIn PDF document text
    • http://2017.letnifestiwal.pl/ckfinder/userfiles/files/45345004599.pdfIn PDF document text
    • http://www.majoriscambio.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1609774c972c8a---ziwezatazalegaxosugo.pdfIn PDF document text
    • http://musorcentrum.hu/files/article/file/87304290053.pdfIn PDF document text
    • https://qboardapp.com/wp-content/plugins/super-forms/uploads/php/files/ef8d105211da01b03901ed0fc5fbec73/32669992820.pdfIn PDF document text
    • https://telechips.com/ckfinder/userfiles/files/wobesupomasinonetigojepo.pdfIn PDF document text
    • https://haysalon.com/public_html/userfiles/file/reripolopika.pdfIn PDF document text
    • https://rux-thai.com/ckfinder/userfiles/files/lojeboxidibo.pdfIn PDF document text
    • http://www.fullertherapy.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e67af466d58---fozimizalutukikositijeka.pdfIn PDF document text
    • http://sandsflooring.co.uk/ckfinder/userfiles/files/funuxifaxujuzezara.pdfIn PDF document text
    • http://passaicvalleyclassof1957.com/clients/44362/File/wejor.pdfIn PDF document text
    • http://grafordexstudents.com/clients/0/05/05b3dbe7dd9dc6f92b523d2b721f2ffd/File/19543520187.pdfIn PDF document text
    • http://dirpub.org/editor/ckfinder/userfiles/files/kotexasawekipibebaduvobi.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000b3b1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB3B1 14788 bytes
SHA-256: 3c2c9457650ac97ff5d754f02a8a814aa291947aaa9b18a1a32a7209523dbd75
font_01_sfnt_off0000d88d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD88D 10876 bytes
SHA-256: 1ae01593d01accc966232b76c867b8e122f18787fd0c72c3c93977b93da31aee
font_02_sfnt_off0000f194.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF194 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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